Our favourite Canadian beaver is sent back to Washington D.C. on a mission by Captain Nemo. Paddy is joined by Ethan Eagle, who tells him about the “twinning” of the Potomac River in the United States, and the Ottawa River in Canada. Both rivers run through national capitols, and they both played (and a continue to play) a huge role in the life and history of each country. Ethan takes Paddy on an Eagle-Eye trip across the massive Potomac Watershed, while Captain Nemo speaks to the continued efforts of Riverkeepers to protect the waters. The episode ends with Nemo zapping Paddy and Ethan into Canada, to explore the Potomac’s “twin”… and to meet an actual Riverkeeper!